Atomic Structure Assignment (Question 4-answer)

Q4)Chlorine-35 atom and Chlorine-37 atom are called isotopes...Use these two examples to explain what is 'isotopes'.

Chlorine-35    
Nucleon number: 35
Proton number: 17
Neutron number: 18 (35-17=18)
Electron number: 17 (same as proton no.)



Look at chlorine-37, RIGHT SIDE

 Chlorine-37
Nucleon number:37
Proton number: 17
Neutron number: 20 (37-17=20)
Electron number: 17 (same as proton no.)

DEFINITION-Isotopes: Different atoms of the same element which have the same number of protons but different number of neutrons.

Chlorine-35 has 18 neutrons whereas Chlorine-37 has 20 neutrons. (Different)
Chlorine-35 and Chlorine-37 both have 17 protons. (Same)
Of course, both are of the same element.-> chlorine (Same)
Since, their nucleon number is different, therefore, they are ISOTOPES! :)